Cam-cutting attachment



G. L. BOWER.

GAM CUTTING ATTACHMENT.

1 APPLICATION r|LED1uNE21.191s.

Patented Aug. 31, 1920.A

2 SHEETS-SHEET l.

INVENTOR ATTORNEY G.v L. BOWER. CAM CUTTING ATTIcHrI/IENT.v APPLICATIONFILED JUNE 2l, 1918.

1,85 1, 365, Patented Aug. 31, 1920.

2 SHEETS-SHEET 2.

IIIIIIII ,.WII

WITNESSES TTOH N EY To all fui/wm', t may `concern UNHTE vSTATES PATENTorififcinff f i" GEORGE I.. BOWEB., or ennnivwoon, MASSACHUSETTS( f Beit vknownthat I, GEORGE L; BoWnR, a citizen of the United States,residing at Greenwood, in the county of Middlesex and State ofMassachusetts, have invented cer tain new and useful Improvements inCam- L Cutting ttachmentstof which the following isa specification.

rlhis invention relates to machineelements,

and more particularly to cam cutting attachments.

- The object of therinvention is to provide a simple and efc'ientattachment this character capable of use en -any milling machine, latheordrill press, Y 1

Another object `is to provide an attachment of this character in Awhichthe master cam is heldyieldably in engagement with the Ystop forcontrolling the movement of the. work carrying member to provide forvtheshaping of the-work in conformity with the master cam.

With the foregoing and other objects'in view, which will appear as thedescription proceeds, the invention resides in the combination andarrangement of parts and in the details of construction hereinafterydescribed and claimed, it being understood that changes in the preciseembodiment of the invention herein disclosed may be made within thescope of what is claimed without departing from the spirit of theinvention.

In the accompanying drawings Figure 1 represents a side elevation of theattachment constituting this invention, partsV being broken off, Y Fig.2 is a plan view thereof.

Fig. 3 is a vertical section taken on the K line 3--3 of Fig. 2, Y Y

Fig. 4 is a transverse vertical section taken on the line 4-4 of Fig. 2,and

Fim 5 isfa similar view taken on the line 5-5 of Fig. 2. y

In the embodiment illustrated, the attachment constitutingthis'invention comprises a base 1 preferably of. cast ironmounted onAwhat may be termed a sub-basev or suitable support 2,. which has risingtherefrom a bracket 3 carrying at its upper end-a grooved pulley 4 for apurpose hereinafter to be described. Y ,l

Rising from the base 1 are a plurality of Vuprights, three being hereshown, and numf bered 5, 6 and 7. These uprights have bearings toreceive and'support aY shaft 8, which is of varying diametersvthroughout ,its

r CAM-CUTTING ATTACHMENT.

Specification of Letters Patent.V

member 8b in the `upright 6, and the smallest end 8c 1n upright y 5 asisv shown" clearly y l Patented. Ai1g.31',"192j0.

Application ,filed June 21, 191s. serial No. 241,174. f f

in Fig. 3. An eye 9 is carried bythe-end 8c of the shaft and -hasaflexible element f 10 connected ytherewith and extended over and ,guidedby the pulley 41witha weight 11 secured to its lower end below the'supporting base 2. Thisweight l1 1 exerts its tension to move the shaft8 longitudinally forward for a purpose presently to be described.V

Splinedfto the shaft 8'between the uprights.

6 andf7 is a, master cam 12v having ,ononey .face thereof'a cam l13,kalthough Vobviously this face may be -yaried to suit conditions isladjustably, 'fixedto 'the shaft 8 by a set scre'w`14, and is forced,against a stop 15 havingV a roller l16 atv .its freeend for 'contactaccording to the cam to becut., This cam .12

with the cam and 'whfich ismountedon af'- standard 17V risingfromthe'base ylyparallel with.y shaft k and to one side thereofas isshown clearly in'vf Fig. 2. This stop 15 `is in with a setscrewll8-extending through the slot thereof-and entering the standard 17yas is shown clearly lin Fig.`2,'which provides for the adjustment ofthestop, to'lvary it in relationto the master cam 12.

The larger rear end 8,EL of the shaft8has y ward to yreceive .the arborofthe work tov be operated on,rwhich is here shown in the `a socket 1 94extending longitudinally in form of ajcam 21. A pin 20 extends longi- Ytudinally ,rearward from the end of the shaft 8 and is designed to enteran aper-Yy ture in the clam 21 to kbe cut, so as to insure the properpositioningwof the Vcam atallk times, it being understood lthat the camis first roughed out, removed and finished, and itis necessary that itbe placed in the same lrelation to the shaft 8 whenreplaced.

The cutter or work Shaper indicated at 22 is shown arranged at one sideof the atv tachment in Fig. 2' andisV positioned to en v Y gage the sideof the .cam 21 to. be shaped, it

being understood that this cutter'22 maybe l changed to meet thecircumstances-requiredin whichis'mounted afworm shaft 2 5'l1aving a wormy26` on its inner end positioned t0 mesh with a ,refrescar 28 Sphnd'fothe so` l y the form of a longitudinally slotted plate 'y ling Athemaster cam. Y

VVhile thisv attachment' is vsimple and` shaft 8" betweenthe uprights 5-and 6. A

hand wheel 27 is fixed to the worm shaft 25 and is adapted for rotatingsaid shaft to actuate gear 28 and through said gear to impart rotarymotion to the shaftV 8. Y

In the use of this attachment, the work-21 having been placed inthe'socket 19 of the shaft, 8, the weight 11 operates to draw the shaftforward, thereby bringing the master cam 12 into Vcontact with theroller 1G on the stop'15, the cam projection 13of thelcam 12jlying inthe path of said roller, soV that after the operator grasps the handwheel 27 and imparts rotary motion to shaft 8 through Athe worm shaft 25Vand gear 28, the cam A12 will turn with shaft 8 and when the projection13 thereon engages roller V16, the shaft8 will move rearwardly againstthe tension of weight 11 and thus cause the 'cutter .22 to Ypass overthe portion of the work 21 in afcorrespondingly curved path -svo thatwhen completedthe cam'21'will correspond tothe master cam 12which'constitutes'the 1pattern for formingv the cam 21. lt is ofVcourse. to be understood that the shape of the work 21r maybe varied byvarystrong in construction it is very efficient in V'operation' and maybe readily manufactured for use in connectionwith any milling mal chine,'drilling' press, or lathe;

The foregoing description and the drawings have reference to what maybeconsidered the preferredor approvedform of my Y invention; Y. Itisftobe understood that I may make such Vchanges in construction andarrangement and combination of parts, ma-

terials, dimensions, etc., as mayprove eX- pedient and fall within. theVscopeY of the claimed invention. y Y' Having thus fully describedl myinvention, what I claim as new and desireto sethereof, a shaft ofvarying diameters mounted to rotate and slide in said bearings, a mastercam fixed to saidshaft between two of said uprights, a standardpositioned on said base' at oneY side of said shaft,'a bar adjustablelongitudinally on Ythe top ofsaid standard and having a roller atoneend` positioned in the path vof'said cam, means for Vexerting a yieldingpullin one direction on said shaft whereby the master cam isrheld inyieldable engagement with said roller, and work 'holding means carriedby one end of said shaft.V

In testimony whereof I aiiix my signature in presence of two'witnesses.

l/Vitnesses :1 3

HARRY A. SIMoNDs, Y CHARLES E. WAL'roN.

GEORGE nownii.

